#!/usr/bin/env python
import os
import re
import sys
import optparse
import subprocess

from os          import path
from collections import defaultdict

from humbug_tools import check_output

parser = optparse.OptionParser()
parser.add_option('--full',
    action='store_true',
    help='Check some things we typically ignore')
(options, args) = parser.parse_args()

os.chdir(path.join(path.dirname(__file__), '..'))


# Exclude some directories and files from lint checking

exclude_trees = """
zephyr/static/third
confirmation
zephyr/tests/frontend/casperjs
zephyr/migrations
node_modules
""".split()

exclude_files = """
humbug/test_settings.py
tools/jslint/jslint.js
""".split()


# Categorize by language all files known to Git

git_files = map(str.strip, check_output(['git', 'ls-files']).split('\n'))
by_lang   = defaultdict(list)

for filepath in git_files:
    if (not filepath or not path.isfile(filepath)
        or (filepath in exclude_files)
        or any(filepath.startswith(d+'/') for d in exclude_trees)):
        continue

    _, exn = path.splitext(filepath)
    if not exn:
        # No extension; look at the first line
        with file(filepath) as f:
            if re.match(r'^#!.*\bpython', f.readline()):
                exn = '.py'

    by_lang[exn].append(filepath)

def has_trailing_whitespace(fn):
    return any(re.search('\s+$', line.strip('\n')) for line in open(fn))

# Invoke the appropriate lint checker for each language,
# and also check files for extra whitespace.

try:
    failed = False

    # Make the lint output bright red
    sys.stdout.write('\x1B[1;31m')
    sys.stdout.flush()

    try:
        subprocess.check_call(['tools/node', 'tools/jslint/check-all.js']
            + by_lang['.js'])
    except subprocess.CalledProcessError:
        failed = True

    for fn in by_lang['.js'] + by_lang['.py']:
        if has_trailing_whitespace(fn):
            sys.stdout.write('Fix whitespace in %s\n' % fn)
            failed = True

    pyflakes = subprocess.Popen(['pyflakes'] + by_lang['.py'],
        stdout = subprocess.PIPE,
        stderr = subprocess.PIPE)

    # pyflakes writes some output (like syntax errors) to stderr. :/
    for pipe in (pyflakes.stdout, pyflakes.stderr):
        for ln in pipe:
            if options.full or not \
                    ('imported but unused' in ln or
                     ("zephyr_mirror_backend.py:" in ln and
                      "redefinition of unused 'simplejson' from line" in ln)):
                sys.stdout.write(ln)
                failed = True

    sys.exit(1 if failed else 0)

finally:
    # Restore normal terminal colors
    sys.stdout.write('\x1B[0m')